* thread #2, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
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* frame #0: 0x0000000100bdfe73 mysqld`st_select_lex::print_limit(this=0x000062b0000a1380, thd=0x000062b00009a270, str=0x000070000eb35000, query_type=QT_EXPLAIN_EXTENDED) at sql_lex.cc:3060
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frame #1: 0x0000000100ef388a mysqld`st_select_lex::print(this=0x000062b0000a1380, thd=0x000062b00009a270, str=0x000070000eb35000, query_type=QT_EXPLAIN_EXTENDED) at sql_select.cc:26391
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frame #2: 0x0000000100bdf010 mysqld`st_select_lex_unit::print(this=0x000062b00009e160, str=0x000070000eb35000, query_type=QT_EXPLAIN_EXTENDED) at sql_lex.cc:2984
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frame #3: 0x0000000100ca7c34 mysqld`execute_sqlcom_select(thd=0x000062b00009a270, all_tables=0x000062b0000a1908) at sql_parse.cc:6533
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frame #4: 0x0000000100c835f5 mysqld`mysql_execute_command(thd=0x000062b00009a270) at sql_parse.cc:3776
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frame #5: 0x0000000100c7073b mysqld`mysql_parse(thd=0x000062b00009a270, rawbuf="explain extended select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 2", length=73, parser_state=0x000070000eb3cce0, is_com_multi=false, is_next_command=false) at sql_parse.cc:8104
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frame #6: 0x0000000100c5e7ff mysqld`dispatch_command(command=COM_QUERY, thd=0x000062b00009a270, packet="", packet_length=73, is_com_multi=false, is_next_command=false) at sql_parse.cc:1850
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frame #7: 0x0000000100c69793 mysqld`do_command(thd=0x000062b00009a270) at sql_parse.cc:1395
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frame #8: 0x00000001012c1ac7 mysqld`do_handle_one_connection(connect=0x000061100003bbb0) at sql_connect.cc:1402
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frame #9: 0x00000001012c106d mysqld`::handle_one_connection(arg=0x000061100003bbb0) at sql_connect.cc:1308
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frame #10: 0x00007fff66370339 libsystem_pthread.dylib`_pthread_body + 126
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frame #11: 0x00007fff663732a7 libsystem_pthread.dylib`_pthread_start + 70
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frame #12: 0x00007fff6636f445 libsystem_pthread.dylib`thread_start + 13
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The stacktrace is
* thread #2, stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
* frame #0: 0x0000000100bdfe73 mysqld`st_select_lex::print_limit(this=0x000062b0000a1380, thd=0x000062b00009a270, str=0x000070000eb35000, query_type=QT_EXPLAIN_EXTENDED) at sql_lex.cc:3060
frame #1: 0x0000000100ef388a mysqld`st_select_lex::print(this=0x000062b0000a1380, thd=0x000062b00009a270, str=0x000070000eb35000, query_type=QT_EXPLAIN_EXTENDED) at sql_select.cc:26391
frame #2: 0x0000000100bdf010 mysqld`st_select_lex_unit::print(this=0x000062b00009e160, str=0x000070000eb35000, query_type=QT_EXPLAIN_EXTENDED) at sql_lex.cc:2984
frame #3: 0x0000000100ca7c34 mysqld`execute_sqlcom_select(thd=0x000062b00009a270, all_tables=0x000062b0000a1908) at sql_parse.cc:6533
frame #4: 0x0000000100c835f5 mysqld`mysql_execute_command(thd=0x000062b00009a270) at sql_parse.cc:3776
frame #5: 0x0000000100c7073b mysqld`mysql_parse(thd=0x000062b00009a270, rawbuf="explain extended select * from t1, t2 where c1 = c2 LIMIT ROWS EXAMINED 2", length=73, parser_state=0x000070000eb3cce0, is_com_multi=false, is_next_command=false) at sql_parse.cc:8104
frame #6: 0x0000000100c5e7ff mysqld`dispatch_command(command=COM_QUERY, thd=0x000062b00009a270, packet="", packet_length=73, is_com_multi=false, is_next_command=false) at sql_parse.cc:1850
frame #7: 0x0000000100c69793 mysqld`do_command(thd=0x000062b00009a270) at sql_parse.cc:1395
frame #8: 0x00000001012c1ac7 mysqld`do_handle_one_connection(connect=0x000061100003bbb0) at sql_connect.cc:1402
frame #9: 0x00000001012c106d mysqld`::handle_one_connection(arg=0x000061100003bbb0) at sql_connect.cc:1308
frame #10: 0x00007fff66370339 libsystem_pthread.dylib`_pthread_body + 126
frame #11: 0x00007fff663732a7 libsystem_pthread.dylib`_pthread_start + 70
frame #12: 0x00007fff6636f445 libsystem_pthread.dylib`thread_start + 13